Flow gradient drives morphological divergence in an Amazon pelagic stream fish

Barros, Thiago Fonseca de; Louvise, José; Caramaschi, Érica Pellegrini

doi:10.1007/s10750-019-3902-2

Cited by 18 publications

(12 citation statements)

References 46 publications

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“…Rapid adaptive radiation has led to fishes in the Characidae family occupying many different ecological niches (Reis et al, 2016). Members of this group display a similar high and laterally compressed body shape (Barros, Louvise, & Caramaschi, 2019) and inhabit a diverse array of environments (streams, rivers and lentic systems), located in and around the Neotropical region (Froese & Pauly, 2018). In addition, fish of the family Characidae exhibit many diverse trophic modes (Hyatt, 1979).…”

Section: Introductionmentioning

confidence: 99%

Morphological traits correlated with resource partitioning among small characin fish species coexisting in a Neotropical river

Delariva

Neves

2020

Ecology of Freshwater Fish

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Body shape variation should play a central role in determining the feeding ability of a fish species. We tested whether variations in feeding resource use of sympatric and closely related fish species could be explained by differences in ecologically relevant metrics, such as body morphology, trophic apparatus or combinations thereof. Fish were sampled at 14 sampling sites from Pelotas River and tributaries, Upper Uruguay, Brazil. The stomach contents of five species of Characidae (Astyanax and Bryconamericus) were analysed by the volumetric method. A geometric morphometric approach was used together with internal morphological traits to predict their patterns of prey use. Significant differences in body depth, snout and caudal peduncle lengths were found. Concomitant pronounced variations were verified to occur among species in structures related to digestion and absorption. Increased numbers of cusps, more pyloric caeca and higher intestinal coefficient values were observed in species that consumed greater proportions of plants. The opposite trends occurred in species that consumed greater proportions of insects. Mixed linear models indicated that the characin species differed significantly in the use of algae, aquatic insects, terrestrial insects, plant remains/seeds and detritus. Dietary differences reflected in low trophic niche overlap. Partial least squares regression results indicated strong correlations between morphological divergences and the corresponding variations in species diet. These outcomes combined confirm that the morphological traits that best enables the exploration of certain resource were an important factor in the resource‐related divergence and were the underlying reasons for these species' respective feeding modes.

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Section: Introductionmentioning

confidence: 99%

Morphological traits correlated with resource partitioning among small characin fish species coexisting in a Neotropical river

Delariva

Neves

2020

Ecology of Freshwater Fish

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“…El presente trabajo contrastó la hipótesis de diferenciación fenotípica a través de diferentes regímenes de flujos de agua (Langerhans, 2008), en dos especies de peces neotropicales; uno de los modelos, C. mivartii se suma a las especies evaluadas con morfometría geométrica del orden Characiformes (Santos & Araújo, 2015;Restrepo-Escobar et al, 2016;Lazzarotto, Barros, Louvise, & Caramaschi, 2017;de Barros, Louvise, & Caramaschi, 2019; Rodrigues Rocha, de Mesquita Alves, Pasa, & Frehner Kavalco, 2019) y el segundo modelo, P. grosskopfii, constituye el primer miembro de Siluriformes evaluado con morfometría geométrica para la determinación de la variación del tamaño y la conformación con respecto a los regímenes de flujo de agua.…”

Section: Discussionunclassified

“…En Brycon henni, el comportamiento reproductivo de la especie parece explicar la presencia de individuos más grandes en los cauces de los ríos colombianos Nare y Guatapé, que en sus quebradas asociadas (Restrepo-Escobar et al, 2016). Sin embargo, los resultados de este estudio contrastan con los encontrados en Hyphessobrycon ericae en los ríos del amazonas brasilero, Sacará y Araticum, donde los tamaños de los individuos fueron significativamente menores en ambientes con altas velocidades que en los de baja velocidad (de Barros et al, 2019). Estos hallazgos, en conjunto con los estudios previos, indican que diferentes factores intrínsecos o medioambientales podrían estar influenciando las diferencias de tamaño, lo que estimula investigaciones futuras.…”

Section: Discussionunclassified

Variación fenotípica de los peces Curimata mivartii (Characiformes: Curimatidae) y Pimelodus grosskopfii (Siluriformes: Pimelodidae) en hábitats lóticos y lénticos

Hincapié-Cruz¹,

Márquez²

2021

RBT

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Introducción: A pesar de su importancia en el rendimiento de la natación y la eficacia biológica individual, la forma del cuerpo y las variaciones de tamaño en respuesta a la velocidad del flujo de agua siguen siendo desconocidas para la mayoría de los peces migratorios de agua dulce en el Neotrópico. Objetivo: Contrastar la hipótesis de variación fenotípica en el tamaño y la conformación del cuerpo de dos especies de peces dulceacuícolas que enfrentan cambios de velocidad a través de sus migraciones en dos ríos pertenecientes a una cuenca neotropical. Métodos: Se utilizó la morfometría geométrica basada en hitos para estudiar las variaciones en el tamaño y la conformación del cuerpo para dos especies de peces Curimata mivartii y Pimelodus grosskopfii en hábitats lóticos y lénticos de la cuenca Colombiana del Magdalena-Cauca. Resultados: Los individuos de C. mivartii de dos hábitats lóticos fueron similares en tamaño y significativamente más grandes que los del hábitat léntico, mientras que los individuos de P. grosskopfii fueron similares en ambos hábitats. Ambas especies mostraron cuerpos más hidrodinámicos en hábitats lóticos y formas corporales más robustas en hábitats lénticos. Conclusión: Ambas especies exhiben cambios fenotípicos en la forma del cuerpo concordantes con las predicciones previas sobre las variaciones morfológicas de los peces. Esta información es relevante para predecir cambios en respuesta a la heterogeneidad ambiental, especialmente inducidos por actividades antropogénicas que cambian las velocidades del agua en el río.

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“…Apesar de aspectos da morfologia trazerem inferências importantes sobre a relação entre os indivíduos e fatores físicos (e.g. fluxo da corrente, de Barros et al 2019), características morfológicas não revelam diferenças individuais que ocorrem em características mais refinadas (e.g. padrões de coloração) (Hurd 1997, Rodrigues et al 2009.…”

Section: Características Mensuradas No Grupo Dos Peixesunclassified

Variação Intraespecífica Em Peixes De Riacho Com Ênfase Na Ecologia Trófica

Manna

Rezende

2021

Oecol. Aust.

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Assessing intraspecific variability in community structure and functioning are still scarce for stream-dwelling fish. However, measuring ecological traits for individuals is important since species’ response for environmental conditions occurs at the individual level, especially in streams which suffers constantly physical disturbances. Intraspecific variability can be measured for several ecological traits, such as morphology, diet, life-history, and habitat use that varies between populations or within populations. Here, we present some methods and studies that evaluated intraspecific trophic variability in stream-dwelling fish. Results revealing the role of individual variation in structure of biological populations and/or assemblages were selected, and principal issues were discussed. There are a lot of statistical tools that can test individual variation including functional indexes and multivariate analyzes. Results generated from such individual analyzes have high potential to explain the functioning of stream fish populations and communities.

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Flow gradient drives morphological divergence in an Amazon pelagic stream fish

Cited by 18 publications

References 46 publications

Morphological traits correlated with resource partitioning among small characin fish species coexisting in a Neotropical river

Morphological traits correlated with resource partitioning among small characin fish species coexisting in a Neotropical river

Variación fenotípica de los peces Curimata mivartii (Characiformes: Curimatidae) y Pimelodus grosskopfii (Siluriformes: Pimelodidae) en hábitats lóticos y lénticos

Variação Intraespecífica Em Peixes De Riacho Com Ênfase Na Ecologia Trófica

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